Mason Poplaw > McCarthy Tétrault > Montreal, Canada > Lawyer Profile

McCarthy Tétrault
1000 De La Gauchetière Street West
Suite 2500
Montréal QC H3B 0A2

Work Department

Litigation: General Commercial


Partner in the Montréal office and formerly a member of the firm’s Board of Partners and Quebec head of the litigation group. Known for his business acumen and broad experience as a corporate commercial litigator, Mason’s practice focuses primarily on corporate disputes, governance, securities, internal investigations, crisis management, insolvency, and restructuring.

Recognized for his ability to successfully manage litigation and investigations matters with a great deal at stake, Mason leverages his considerable corporate and financial industry knowledge to find practical solutions to complex disputes. Working with a range of clients including financial institutions, public and privately held corporations, and trustees, he takes a strategic approach to securities and banking class actions, financial product liabilities cases, financial frauds, corporate governance issues, plans of arrangement, liquidation, oppression remedies, complex contract disputes, and directors’ liabilities.

Clients appreciate Mason’s ability to gain insight into the dispute and bring the right angles and arguments before the court to achieve swift and successful resolutions. He has appeared before all Québec judicial courts, before the Supreme Court of Canada, and in numerous commercial arbitration proceedings.


Barreau du Québec, 1987.


CBA; Insolvency Institute of Canada; Turnaround Management Association; Risk Management Institute.

Lawyer Rankings

Canada > Dispute Resolution

(Leading individuals: Quebec)

Mason PoplawMcCarthy Tétrault

McCarthy Tétrault fields an impressive national dispute resolution practice, praised for its ‘exceptional bench strength and business advisory skills‘. It has one of Ontario’s leading litigation departments, which is renowned for handling precedent-setting matters, and appearing before all levels of court and tribunals across the country. A recent highlight saw the team defending Unity Health Toronto in its high-profile C$300m lawsuit with Zurich Insurance. This was co-led by the ‘exceptionalSarit Batner, one of the Toronto office’s standout partners, where securities-focused R Paul Steep is another partner to note. Arbitration is also a strength of the team, and Junior Sirivar is a key contact in that respect, acting in international arbitrations, with sector strengths including mining, banking, telecoms and healthcare. The group in Vancouver is well known for its work in the mining and energy sectors, as well as in cases involving environmental law and Indigenous rights. Jill Yates leads the team there and heads the national class action group, while Michael Feder is a leading name in the market, ‘terrific both at trial and on appeal‘. The team looks to have a bright future ahead with Miranda Lam building a strong commercial litigation practice and expertise in the retail sector, and Aidan Cameron noted for construction and insurance coverage matters. Patrick Williams also stands out at the associate level. The practice in Quebec has gone from strength to strength, led by professional liability expert Steeves Bujold. Mason Poplaw and François Giroux frequently act as lead counsel on some of the province’s standout disputes, and the team is one of the market leaders for insolvencies and class actions. Michel Gagné and Isabelle Vendette are further key figures, as is Emmanuelle Poupart in medical law disputes. In Alberta, the team is led by Douglas Yoshida and other key contacts include expert in the natural resources sector Sean Smyth, and Kara Smyth who also has an impressive practice and was involved in a number of major cases during 2020 and 2021.